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const {
ArrayPrototypeForEach,
ArrayPrototypeMap,
ArrayPrototypePush,
FunctionPrototypeBind,
FunctionPrototypeCall,
ObjectAssign,
ObjectCreate,
ObjectDefineProperty,
ObjectDefineProperties,
ObjectGetOwnPropertyDescriptors,
ObjectGetPrototypeOf,
ObjectSetPrototypeOf,
ObjectValues,
ReflectApply,
Symbol,
SymbolFor,
} = primordials;
const {
kEmptyObject,
kEnumerableProperty,
} = require('internal/util');
const {
handle_onclose: handleOnCloseSymbol,
oninit: onInitSymbol,
no_message_symbol: noMessageSymbol
} = internalBinding('symbols');
const {
MessagePort,
MessageChannel,
broadcastChannel,
drainMessagePort,
moveMessagePortToContext,
receiveMessageOnPort: receiveMessageOnPort_,
stopMessagePort,
checkMessagePort,
DOMException,
} = internalBinding('messaging');
const {
getEnvMessagePort
} = internalBinding('worker');
const { Readable, Writable } = require('stream');
const {
Event,
EventTarget,
NodeEventTarget,
defineEventHandler,
initNodeEventTarget,
kCreateEvent,
kNewListener,
kRemoveListener,
} = require('internal/event_target');
const { inspect } = require('internal/util/inspect');
const {
codes: {
ERR_INVALID_ARG_TYPE,
ERR_INVALID_THIS,
ERR_MISSING_ARGS,
}
} = require('internal/errors');
const kData = Symbol('kData');
const kHandle = Symbol('kHandle');
const kIncrementsPortRef = Symbol('kIncrementsPortRef');
const kLastEventId = Symbol('kLastEventId');
const kName = Symbol('kName');
const kOrigin = Symbol('kOrigin');
const kOnMessage = Symbol('kOnMessage');
const kOnMessageError = Symbol('kOnMessageError');
const kPort = Symbol('kPort');
const kPorts = Symbol('kPorts');
const kWaitingStreams = Symbol('kWaitingStreams');
const kWritableCallbacks = Symbol('kWritableCallbacks');
const kSource = Symbol('kSource');
const kStartedReading = Symbol('kStartedReading');
const kStdioWantsMoreDataCallback = Symbol('kStdioWantsMoreDataCallback');
const kCurrentlyReceivingPorts =
SymbolFor('nodejs.internal.kCurrentlyReceivingPorts');
const kType = Symbol('kType');
const messageTypes = {
UP_AND_RUNNING: 'upAndRunning',
COULD_NOT_SERIALIZE_ERROR: 'couldNotSerializeError',
ERROR_MESSAGE: 'errorMessage',
STDIO_PAYLOAD: 'stdioPayload',
STDIO_WANTS_MORE_DATA: 'stdioWantsMoreData',
LOAD_SCRIPT: 'loadScript'
};
// We have to mess with the MessagePort prototype a bit, so that a) we can make
// it inherit from NodeEventTarget, even though it is a C++ class, and b) we do
// not provide methods that are not present in the Browser and not documented
// on our side (e.g. stopMessagePort).
const messagePortPrototypePropertyDescriptors = ObjectGetOwnPropertyDescriptors(MessagePort.prototype);
const propertiesValues = ObjectValues(messagePortPrototypePropertyDescriptors);
for (let i = 0; i < propertiesValues.length; i++) {
// We want to use null-prototype objects to not rely on globally mutable
// %Object.prototype%.
ObjectSetPrototypeOf(propertiesValues[i], null);
}
// Save a copy of the original set of methods as a shallow clone.
const MessagePortPrototype = ObjectCreate(
ObjectGetPrototypeOf(MessagePort.prototype),
messagePortPrototypePropertyDescriptors);
// Set up the new inheritance chain.
ObjectSetPrototypeOf(MessagePort, NodeEventTarget);
ObjectSetPrototypeOf(MessagePort.prototype, NodeEventTarget.prototype);
// Copy methods that are inherited from HandleWrap, because
// changing the prototype of MessagePort.prototype implicitly removed them.
MessagePort.prototype.ref = MessagePortPrototype.ref;
MessagePort.prototype.unref = MessagePortPrototype.unref;
MessagePort.prototype.hasRef = function() {
return !!FunctionPrototypeCall(MessagePortPrototype.hasRef, this);
};
function validateMessagePort(port, name) {
if (!checkMessagePort(port))
throw new ERR_INVALID_ARG_TYPE(name, 'MessagePort', port);
}
function isMessageEvent(value) {
return value != null && kData in value;
}
class MessageEvent extends Event {
constructor(type, {
data = null,
origin = '',
lastEventId = '',
source = null,
ports = [],
} = kEmptyObject) {
super(type);
this[kData] = data;
this[kOrigin] = `${origin}`;
this[kLastEventId] = `${lastEventId}`;
this[kSource] = source;
this[kPorts] = [...ports];
if (this[kSource] !== null)
validateMessagePort(this[kSource], 'init.source');
for (let i = 0; i < this[kPorts].length; i++)
validateMessagePort(this[kPorts][i], `init.ports[${i}]`);
}
}
ObjectDefineProperties(MessageEvent.prototype, {
data: {
__proto__: null,
get() {
if (!isMessageEvent(this))
throw new ERR_INVALID_THIS('MessageEvent');
return this[kData];
},
enumerable: true,
configurable: true,
set: undefined,
},
origin: {
__proto__: null,
get() {
if (!isMessageEvent(this))
throw new ERR_INVALID_THIS('MessageEvent');
return this[kOrigin];
},
enumerable: true,
configurable: true,
set: undefined,
},
lastEventId: {
__proto__: null,
get() {
if (!isMessageEvent(this))
throw new ERR_INVALID_THIS('MessageEvent');
return this[kLastEventId];
},
enumerable: true,
configurable: true,
set: undefined,
},
source: {
__proto__: null,
get() {
if (!isMessageEvent(this))
throw new ERR_INVALID_THIS('MessageEvent');
return this[kSource];
},
enumerable: true,
configurable: true,
set: undefined,
},
ports: {
__proto__: null,
get() {
if (!isMessageEvent(this))
throw new ERR_INVALID_THIS('MessageEvent');
return this[kPorts];
},
enumerable: true,
configurable: true,
set: undefined,
},
});
const originalCreateEvent = EventTarget.prototype[kCreateEvent];
ObjectDefineProperty(
MessagePort.prototype,
kCreateEvent,
{
__proto__: null,
value: function(data, type) {
if (type !== 'message' && type !== 'messageerror') {
return ReflectApply(originalCreateEvent, this, arguments);
}
const ports = this[kCurrentlyReceivingPorts];
this[kCurrentlyReceivingPorts] = undefined;
return new MessageEvent(type, { data, ports });
},
configurable: false,
writable: false,
enumerable: false,
});
// This is called from inside the `MessagePort` constructor.
function oninit() {
initNodeEventTarget(this);
setupPortReferencing(this, this, 'message');
this[kCurrentlyReceivingPorts] = undefined;
}
defineEventHandler(MessagePort.prototype, 'message');
defineEventHandler(MessagePort.prototype, 'messageerror');
ObjectDefineProperty(MessagePort.prototype, onInitSymbol, {
__proto__: null,
enumerable: true,
writable: false,
value: oninit
});
class MessagePortCloseEvent extends Event {
constructor() {
super('close');
}
}
// This is called after the underlying `uv_async_t` has been closed.
function onclose() {
this.dispatchEvent(new MessagePortCloseEvent());
}
ObjectDefineProperty(MessagePort.prototype, handleOnCloseSymbol, {
__proto__: null,
enumerable: false,
writable: false,
value: onclose
});
MessagePort.prototype.close = function(cb) {
if (typeof cb === 'function')
this.once('close', cb);
FunctionPrototypeCall(MessagePortPrototype.close, this);
};
ObjectDefineProperty(MessagePort.prototype, inspect.custom, {
__proto__: null,
enumerable: false,
writable: false,
value: function inspect() { // eslint-disable-line func-name-matching
let ref;
try {
// This may throw when `this` does not refer to a native object,
// e.g. when accessing the prototype directly.
ref = FunctionPrototypeCall(MessagePortPrototype.hasRef, this);
} catch { return this; }
return ObjectAssign(ObjectCreate(MessagePort.prototype),
ref === undefined ? {
active: false,
} : {
active: true,
refed: ref
},
this);
}
});
function setupPortReferencing(port, eventEmitter, eventName) {
// Keep track of whether there are any workerMessage listeners:
// If there are some, ref() the channel so it keeps the event loop alive.
// If there are none or all are removed, unref() the channel so the worker
// can shutdown gracefully.
port.unref();
eventEmitter.on('newListener', function(name) {
if (name === eventName) newListener(eventEmitter.listenerCount(name));
});
eventEmitter.on('removeListener', function(name) {
if (name === eventName) removeListener(eventEmitter.listenerCount(name));
});
const origNewListener = eventEmitter[kNewListener];
eventEmitter[kNewListener] = function(size, type, ...args) {
if (type === eventName) newListener(size - 1);
return ReflectApply(origNewListener, this, arguments);
};
const origRemoveListener = eventEmitter[kRemoveListener];
eventEmitter[kRemoveListener] = function(size, type, ...args) {
if (type === eventName) removeListener(size);
return ReflectApply(origRemoveListener, this, arguments);
};
function newListener(size) {
if (size === 0) {
port.ref();
FunctionPrototypeCall(MessagePortPrototype.start, port);
}
}
function removeListener(size) {
if (size === 0) {
stopMessagePort(port);
port.unref();
}
}
}
class ReadableWorkerStdio extends Readable {
constructor(port, name) {
super();
this[kPort] = port;
this[kName] = name;
this[kIncrementsPortRef] = true;
this[kStartedReading] = false;
this.on('end', () => {
if (this[kStartedReading] && this[kIncrementsPortRef]) {
if (--this[kPort][kWaitingStreams] === 0)
this[kPort].unref();
}
});
}
_read() {
if (!this[kStartedReading] && this[kIncrementsPortRef]) {
this[kStartedReading] = true;
if (this[kPort][kWaitingStreams]++ === 0)
this[kPort].ref();
}
this[kPort].postMessage({
type: messageTypes.STDIO_WANTS_MORE_DATA,
stream: this[kName]
});
}
}
class WritableWorkerStdio extends Writable {
constructor(port, name) {
super({ decodeStrings: false });
this[kPort] = port;
this[kName] = name;
this[kWritableCallbacks] = [];
}
_writev(chunks, cb) {
this[kPort].postMessage({
type: messageTypes.STDIO_PAYLOAD,
stream: this[kName],
chunks: ArrayPrototypeMap(chunks,
({ chunk, encoding }) => ({ chunk, encoding })),
});
ArrayPrototypePush(this[kWritableCallbacks], cb);
if (this[kPort][kWaitingStreams]++ === 0)
this[kPort].ref();
}
_final(cb) {
this[kPort].postMessage({
type: messageTypes.STDIO_PAYLOAD,
stream: this[kName],
chunks: [ { chunk: null, encoding: '' } ]
});
cb();
}
[kStdioWantsMoreDataCallback]() {
const cbs = this[kWritableCallbacks];
this[kWritableCallbacks] = [];
ArrayPrototypeForEach(cbs, (cb) => cb());
if ((this[kPort][kWaitingStreams] -= cbs.length) === 0)
this[kPort].unref();
}
}
function createWorkerStdio() {
const port = getEnvMessagePort();
port[kWaitingStreams] = 0;
return {
stdin: new ReadableWorkerStdio(port, 'stdin'),
stdout: new WritableWorkerStdio(port, 'stdout'),
stderr: new WritableWorkerStdio(port, 'stderr')
};
}
function receiveMessageOnPort(port) {
const message = receiveMessageOnPort_(port?.[kHandle] ?? port);
if (message === noMessageSymbol) return undefined;
return { message };
}
function onMessageEvent(type, data) {
this.dispatchEvent(new MessageEvent(type, { data }));
}
function isBroadcastChannel(value) {
return value?.[kType] === 'BroadcastChannel';
}
class BroadcastChannel extends EventTarget {
/**
* @param {string} name
*/
constructor(name) {
if (arguments.length === 0)
throw new ERR_MISSING_ARGS('name');
super();
this[kType] = 'BroadcastChannel';
this[kName] = `${name}`;
this[kHandle] = broadcastChannel(this[kName]);
this[kOnMessage] = FunctionPrototypeBind(onMessageEvent, this, 'message');
this[kOnMessageError] =
FunctionPrototypeBind(onMessageEvent, this, 'messageerror');
this[kHandle].on('message', this[kOnMessage]);
this[kHandle].on('messageerror', this[kOnMessageError]);
}
[inspect.custom](depth, options) {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
if (depth < 0)
return 'BroadcastChannel';
const opts = {
...options,
depth: options.depth == null ? null : options.depth - 1
};
return `BroadcastChannel ${inspect({
name: this[kName],
active: this[kHandle] !== undefined,
}, opts)}`;
}
/**
* @type {string}
*/
get name() {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
return this[kName];
}
/**
* @returns {void}
*/
close() {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
if (this[kHandle] === undefined)
return;
this[kHandle].off('message', this[kOnMessage]);
this[kHandle].off('messageerror', this[kOnMessageError]);
this[kOnMessage] = undefined;
this[kOnMessageError] = undefined;
this[kHandle].close();
this[kHandle] = undefined;
}
/**
*
* @param {any} message
* @returns {void}
*/
postMessage(message) {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
if (arguments.length === 0)
throw new ERR_MISSING_ARGS('message');
if (this[kHandle] === undefined)
throw new DOMException('BroadcastChannel is closed.');
if (this[kHandle].postMessage(message) === undefined)
throw new DOMException('Message could not be posted.');
}
// The ref() method is Node.js specific and not part of the standard
// BroadcastChannel API definition. Typically we shouldn't extend Web
// Platform APIs with Node.js specific methods but ref and unref
// are a bit special.
/**
* @returns {BroadcastChannel}
*/
ref() {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
if (this[kHandle])
this[kHandle].ref();
return this;
}
// The unref() method is Node.js specific and not part of the standard
// BroadcastChannel API definition. Typically we shouldn't extend Web
// Platform APIs with Node.js specific methods but ref and unref
// are a bit special.
/**
* @returns {BroadcastChannel}
*/
unref() {
if (!isBroadcastChannel(this))
throw new ERR_INVALID_THIS('BroadcastChannel');
if (this[kHandle])
this[kHandle].unref();
return this;
}
}
ObjectDefineProperties(BroadcastChannel.prototype, {
name: kEnumerableProperty,
close: kEnumerableProperty,
postMessage: kEnumerableProperty,
});
defineEventHandler(BroadcastChannel.prototype, 'message');
defineEventHandler(BroadcastChannel.prototype, 'messageerror');
module.exports = {
drainMessagePort,
messageTypes,
kPort,
kIncrementsPortRef,
kWaitingStreams,
kStdioWantsMoreDataCallback,
moveMessagePortToContext,
MessagePort,
MessageChannel,
MessageEvent,
receiveMessageOnPort,
setupPortReferencing,
ReadableWorkerStdio,
WritableWorkerStdio,
createWorkerStdio,
BroadcastChannel,
};
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